Of the 302,531 students across the world who took the AP Calculus AB exam last year, Cedrick was one of only 12 to earn every single point. He and his classmates took the exam — a three-hour, 15-minute test administered by the nonprofit College Board for possible college credit — in May.

“It's been surreal,” Cedrick said Sunday morning after friends texted him a screenshot of the president's tweet. “The first thing I felt — my heart was pounding. To have the most important man in the world tweeting about you? You have to be excited.”

Cedrick — a quiet, humble student who is quick to thank his teachers and parents for his success — said he'll join the president at the fair “if his offer still holds.”

The White House Science Fair, hosted by the president, features projects, designs and experiments from students across the country and celebrates students who excel in science, technology, engineering and math.

Cedrick's story has made headlines around the world since his score was announced by the Los Angeles Unified School District last week. He is the son of Lilian and Marcos Argueta, both of whom came to the United States as young adults — she from the Philippines, he from El Salvador. Lilian, a licensed vocational nurse, works two jobs at nursing homes, and Marcos is a maintenance worker at one of those nursing homes.